Fix #80242: imap_mail_compose() segfaults for multipart with rfc822 #6345
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libc-client expects TYPEMESSAGE with an explicit subtype of RFC822 to
have a nested.msg (otherwise there will be a segfault during free), but
not to have any contents.text.data (this will leak otherwise).
Turns out that this is basically the same issue as PR #6343, but that PR is about a regression in 7.3.24RC1 and 7.4.12RC1, while this "never" worked.